So tired of these hang up calls. This number called me at 8:26 CST today (10/23/15). I picked the phone up on the second ring and answered "Hello" but no one answered...all I got was air, as if someone was listening on the other end of the line. After about 15 seconds of silence the caller disconnected. One report I found said it was AT&T but the caller ID said "Unknown Name". I did not try calling back as I don't need to solicit follow up calls of this nature.